<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>三角形</title>
		<style>
			.triangle {
				width: 0px;
				height: 0px;
				margin: 100px auto;
				border-top: 50px solid transparent;
				border-right: 50px solid transparent;
				border-bottom: 50px solid transparent;
				border-left: 70px solid black;
				border-radius: 6px;
			}
		</style>
	</head>

	<body>
		<div class="triangle"></div>
	</body>
</html>
